Eurocode 3: Design of Steel Structures ready for practice

EUROCODES Background and Applications, Brussels, 19th February 2008Prof. Ir. Frans Bijlaard February 22, 20081

Faculty of Civil Engineering and Geosciences Vermelding onderdeel organisatie

Contents of PresentationHistory and Context of Eurocode 3 Structure of Eurocode 3 Safety Level Introduction of Eurocode 3 in the Design Practice Conclusions

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History and Context of Eurocode 3 Design of Steel StructuresNEN AFNOR DIN BS

EN

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History and Context of Eurocode 3 Design of Steel Structures Design in one country followed by erection in another country Standard building rules for whole Euro-market Easier to work in other countries More efficient transfer of research results in rules Harmonized core material for local handbooks, design aids and educational material

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History and Context of Eurocode 3 Design of Steel StructuresCHALLENGE FOR EUROCODES Ensure structurally safe and serviceable structures Provide rules which are sufficiently detailed to avoid disputes Facilitate international competition on an even playing field Permit innovation in accordance with essential principles5

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CEN TC250EUROCODES EC 0 : Basis of design Hor. group 1: Terminology Hor. group 2: Bridges Hor. group 3: Fire

SC1EC1 : Actions

SC2 SC3 EC2: EC3: February Concrete22, 2008 Steel

SC4 EC4: Composite

SC5 EC5: Timber

SC6 EC6: Mason

SC7 EC7: Geo

SC8 EC8: Earthq

SC9 EC9: 6 Alu

RELATION WITH OTHER ENsEN 1990 EN 1990 Basis of Design Basis of Design EN 1991 EN 1991 Actions Actions

EN 1090 EN 1090 Execution Execution

EN 1993 EN 1993 Steel Structures Steel StructuresEN 1997 Geotech. EN 1997 Geotech. EN 1998 Earthquake EN 1998 Earthquake

EN : Steels EN : Steels EN : Sections EN : Sections EN : Bolts EN : Bolts EN : Welding EN : Welding7

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Structure of Eurocode 3 General Parts EN 1993-1-1: General rules and rules for buildings

Rules for strength and stability Rules specific for Buildings

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Structure of Eurocode 3 General Parts EN 1993-1-2:5

Structural fire designStages of a natural fire - and the standard fire test curveTemperature Pre-Flashover Flashover Post-Flashover 1000-1200C

Natural fire curve

ISO834 standard fire curve Time Ignition - Smouldering Heating Cooling .

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Structure of Eurocode 3 General Parts prEN 1993-1-3: Supplementary rules for cold formed members and sheeting

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Structure of Eurocode 3 General Parts prEN 1993-1-4: prEN 1993-1-5: Supplementary rules for stainless steels Plated structural elements (in-plane loaded)

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Structure of Eurocode 3 General Parts prEN 1993-1-6: Strength and stability of shells prEN 1993-1- 7: Plated structural elements (transversely loaded) EN 1993-1- 8: Design of jointsTension zone

Shear zone

VCompression zone

M

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Structure of Eurocode 3 General Parts EN 1993-1- 9: EN 1993-1-10: Fatigue Material toughness and throughthickness properties prEN 1993-1-11: Design of structures with tension elements prEN 1993-1-12: Additional rules for the extension of EN 1993 up to steel grades S700

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Structure of Eurocode 3 Application Parts prEN 1993-2: Steel bridges

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Structure of Eurocode 3 Application Parts prEN 1993-3-1: Towers and MastsMasts and Towers

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Structure of Eurocode 3 Application Parts prEN prEN prEN prEN 1993-3-2: 1993-4-1: 1993-4-2: 1993-4-3: Chimneys Silos Tanks Pipelines

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Structure of Eurocode 3 Application Parts prEN 1993-5: prEN 1993-6: Piling Crane supporting structures

y

y

y

y

z

z z (a) (b) (c)

z

(d)

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Safety Level

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Safety Level

In applying the rules in Eurocode 3 a structural safety is reached of not less than the reliability index

= 3,8 Member states are entitled to choose their own safety level for structures

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Safety Level The rules are set up such that they contain safety elements of which the value can be chosen by the individual member state. These safety elements are for instance the partial (safety) factors for the resistance (limit states) of structural elements. For these safety elements in the Eurocodes so-called recommended values are given in notes accompanying the clauses containing these safety elements.February 22, 2008 20

Safety LevelTo promote harmonization of design rules throughout Europe the Commission strongly advises to choose the recommended values for these safety elements.

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Introduction of Eurocode 3 in the Design Practice Criticism: Eurocode 3 is very advanced but it is complex to use To help the designer in practice there is a need for: -Background information -Introduction courses with worked examples -User-friendly software (expert-systems)

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Introduction of Eurocode 3 in the Design Practice Criticism: Eurocode 3 is very advanced but it is complex to use

Not simple rules sell steel but Simple TOOLS sell Steel

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Conclusions The process of harmonization of design standards of the member countries of CEN did take a period of about three decades. Compared to the life time of an existing code in a country of about 15 years, for the Eurocodes this period is not so bad. Eurocode 3 Design of Steel Structures comprises a fairly complete set of design codes for uniquely designed structures and for a wide range of structural steel products.February 22, 2008 24

Conclusions The introduction of the Eurocodes in the design practice needs great care. Design examples, guide lines, design tools (special software) should be developed in the various countries. Explanations of differences and the justification for these changes should be supplied to support the acceptation of the Eurocodes. To support these local activities in the various member states, background documents need to be drafted on which local design tools and examples need be based.February 22, 2008 25

THANK YOU FOR YOUR ATTENTION

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